CUDA_LIBRARY_PATH on Ubuntu

[bheisler]

Some users of RustaCUDA have found that setting CUDA_LIBRARY_PATH isn't sufficient to allow them to build cuda-sys: bheisler/RustaCUDA#15

I ran into a similar problem while setting up my Travis-CI builds for RustaCUDA on an Ubuntu VM which might be related. If I set CUDA_LIBRARY_PATH to /usr/local/cuda-8.0/targets/x86_64-linux/lib, it could find libcublas.so and libcudart.so but not libcuda.so (which is in /usr/local/cuda-8.0/targets/x86_64-linux/lib/stubs for some reason).

[alphastrata]

Is there a good solution to this yet?

[LutzCle]

Setting

export C_INCLUDE_PATH="/usr/local/cuda/include"
export LIBRARY_PATH="/usr/local/cuda/lib64"

works for me on Ubuntu 16.04 and 18.04. I don't have CUDA_LIBRARY_PATH set.

[bheisler]

Changing the path that the GCC linker searches for includes and libraries - that seems like a pretty big hammer. I'd prefer to figure out why CUDA_LIBRARY_PATH doesn't work and fix cuda-sys, if possible.